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djyliett [7]
2 years ago
14

Which does a reference point provide? Select 2 correct choices.

Physics
2 answers:
erastova [34]2 years ago
6 0

Answer:

1 and 4

Explanation:

grigory [225]2 years ago
4 0

Answer:

The correct answers are 1 and 5

Explanation:

A reference point provides a position from which to measure future distance. This is possible because to measure a distance we must have a reference point at which to take the measurement. In general, any point in space takes as reference the origin of coordinates.

It also serves to detect the movement of an object, since if the distance between the object and the reference point varies, it can be determined that the object is in motion.

Have a nice day!

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A small plastic bead has been charged to -15nC.
marishachu [46]

Answer:

Explanation:

q = - 15 n C = - 15 x 10^-9 c

(a) d = 0.9 cm = 0.009 m

electric field on proton, E = Kq/d²

E = 9 x 10^9 x 15 x 10^-9 / (0.009)²

E = 1.67 x 10^6 N/C

Force on proton, F = charge on proton x Electric field

F = 1.6 x 10^-19 x 1.67 x 10^6 = 2.67 x 10^-13 N

acceleration of proton, a = F / m

a = (2.67 x 10^-13) / (1.67 x 10^-27)

a = 1.6 x 10^14 m/s²

(B) the direction of acceleration is towards the bead, as the force is attractive.

(C) d = 0.9 cm = 0.009 m

electric field on proton, E = Kq/d²

E = 9 x 10^9 x 15 x 10^-9 / (0.009)²

E = 1.67 x 10^6 N/C

Force on electron, F = charge on electron x Electric field

F = 1.6 x 10^-19 x 1.67 x 10^6 = 2.67 x 10^-13 N

acceleration of proton, a = F / m

a = (2.67 x 10^-13) / (9.1 x 10^-31)

a = 3 x 10^17 m/s²

(D) the direction of acceleration is away from the bead, as the force is repulsive.  

8 0
3 years ago
How does groundwater move through the lithosphere?
Viktor [21]
Aquifer- the layer permeable rock that has connecting pores & transmit water freely, the artesian well water rises to the surface.

Hope this helps!
5 0
3 years ago
HHHEEEEELLLPPPP!!!
SIZIF [17.4K]
The correct answer is the Sun.i hope that helped! if you have any questions or concerns about the answer i gave you please let me know!!
4 0
3 years ago
How to rearrange the formula f = ma and solve for m
GuDViN [60]
F /a = m


is the answer
7 0
3 years ago
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Amy counts the wave crests traveling down a stretched string.Five wave crests pass Amy in two seconds.What is the frequency of t
Verdich [7]
The frequency of a wave is a measure of the number of waves that passes through a point per unit of time. It has SI units of s^-1. It is also equivalent to Hertz (Hz). We calculate the frequency of the wave described as follows:

Frequency = 5 waves / 2 s = 2.5 / s or 2.5 Hz
4 0
3 years ago
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